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I had surgery on my left hand to reattach the tendons in my thumb (don't ask) & the support cast that I had to wear afterwards was made from Wonderflex. It held up really well & I didn't notice any softening of the cast in the summer weather. If I could find a local supplier I would use this instead of Sintra.

wonderflex is what some of the Japanese gundam cosplayers use to make their robot costumes. It seems to be able to take a lot of abuse, but they also use thick craft foam, which is very fragile when heat formed and doesn't retain its shape. It is easy to work with, but I wouldn't use it for everything. I have only used it for small things. Here's an example of craft foam and wonderflex.
As I understand it, the helmets are a combination of the two.